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prealgebra intermediate

Problem

Karla drove her vehicle 12,000 miles last year. How many gallons of gasoline would she have saved last year had she driven a fuel-efficient hybrid car averaging 48 miles per gallon rather than an SUV averaging 15 miles per gallon?
Solution
Karla used gallons to drive 12000 miles. Had she driven the hybrid, she would have used gallons. Therefore, she would have saved gallons.
Final answer
550